Hi!
Me, Ray(Halistan), and KouH have all painted our caps to try to match the wheel. I didn't cost very much as I just went to Wal-Mart and bought some silver auto paint for $2.97.
Since the paint color was a little to light, I put an undercoat of black primer. Then I just lightly covered them in coats of the silver until it looked how I wanted it to..
In certain light you can see a difference but over all they look pretty good.
Ray actually put several clear coats over his caps which helped restore some shine as well as provided a bit of protection from daily wear 'n tear.
I definitely prefer my caps now to being half silver and half yellow...